The invention discloses an annular acetal ketals compound and their application. The structural formula of the annular acetal and ketals compound is (I). The compound prepared in this invention possesses not only the doublet structure of 1,3-diether and 1,1-diether, but also possesses solid space conformation. When employing the compound for preparing Ziegler-Natta olefin polymerization catalyst as electron donor, the coordination direction of MgCl2 and TiCl4 is easier to be decided, which improves the catalyzing property of the catalyst further, especially improves the stereo selectivity of the catalyst.